Mariehamn — Water Temperature in July

Water Temperature Range

14°C

minimum

18°C

average

23°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2025	2024	2023	2022
JUL 1	17°C	12°C	16°C	17°C
JUL 2	17°C	12°C	17°C	17°C
JUL 3	17°C	13°C	17°C	17°C
JUL 4	16°C	13°C	16°C	17°C
JUL 5	18°C	13°C	19°C	18°C
JUL 6	18°C	13°C	18°C	17°C
JUL 7	17°C	13°C	18°C	17°C
JUL 8	17°C	13°C	18°C	17°C
JUL 9	17°C	13°C	18°C	16°C
JUL 10	17°C	13°C	18°C	16°C
JUL 11	18°C	14°C	19°C	16°C
JUL 12	18°C	14°C	19°C	16°C
JUL 13	17°C	14°C	19°C	16°C
JUL 14	18°C	14°C	21°C	16°C
JUL 15	18°C	14°C	20°C	15°C
JUL 16	20°C	14°C	21°C	23°C
JUL 17	18°C	14°C	21°C	16°C
JUL 18	19°C	15°C	20°C	17°C
JUL 19	17°C	14°C	19°C	17°C
JUL 20	18°C	15°C	18°C	18°C
JUL 21	19°C	15°C	18°C	18°C
JUL 22	20°C	18°C	19°C	18°C
JUL 23	20°C	18°C	19°C	18°C
JUL 24	19°C	18°C	19°C	18°C
JUL 25	19°C	20°C	18°C	18°C
JUL 26	19°C	20°C	19°C	16°C
JUL 27	19°C	20°C	19°C	16°C
JUL 28	20°C	22°C	20°C	16°C
JUL 29	20°C	21°C	20°C	16°C
JUL 30	20°C	20°C	18°C	17°C
JUL 31	19°C	20°C	18°C	16°C

July: Climate and Swimming Opportunities

Average Night Air Temperature

13°C

Average Day Air Temperature

22°C

Precipitation Amount per Month

68 mm

Number of Rainy Days

Daylight per Day

18 hrs

Sunshine per Day

8 hrs

Average Wind Speed

14 km/h

Average Humidity

73%

At such water and air temperatures, swimming feels cool and invigorating. It’s comfortable for a quick dip, and you’ll feel fine as long as you warm up soon after.